aEpipteric(Anat) Pertaining to a small Wormian bone sometimes present in the human skull between the parietal and the great wing of the sphenoid.
Century Dictionary and Cyclopedia
epiptericSituated over the alisphenoid or greater wing of the sphenoid bone: specifically applied, in human anatomy, to a supernumerary or epactal bone of the skull sometimes found in the fontanel at the anterior inferior angle of the parietal bone, just above the end of the alisphenoid.
Webster's Revised Unabridged Dictionary
Pref. epi-, + Gr. wing. So called because above the wing of the sphenoid